Large scale directional anomalies in the WMAP 5yr ILC map

We study the alignments of the low multipoles of CMB anisotropies with specific directions in the sky (i.e. the dipole, the north Ecliptic pole, the north Galactic pole and the north Super Galactic pole). Performing 105 random extractions we have found that: 1) separately quadrupole and octupole are...

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Bibliographic Details
Published inJournal of cosmology and astroparticle physics Vol. 2010; no. 3; p. 019
Main Authors Gruppuso, Alessandro, Gorski, Krzysztof M
Format Journal Article
LanguageEnglish
Published United States IOP Publishing 01.03.2010
Subjects
ANISOTROPY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CORRELATIONS
COSMOLOGY
DIPOLES
OCTUPOLES
RELICT RADIATION
VECTORS
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Summary:We study the alignments of the low multipoles of CMB anisotropies with specific directions in the sky (i.e. the dipole, the north Ecliptic pole, the north Galactic pole and the north Super Galactic pole). Performing 105 random extractions we have found that: 1) separately quadrupole and octupole are mildly orthogonal to the dipole but when they are considered together, in analogy to Copi2006, we find an unlikely orthogonality at the level of 0.8% C.L.; 2) the multipole vectors associated to = 4 are unlikely aligned with the dipole at 99.1% C.L.; 3) the multipole vectors associated to = 5 are mildly orthogonal to the dipole but when we consider only maps that show exactly the same correlation among the multipoles as in the observed WMAP 5yr ILC, these multipole vectors are unlikely orthogonal to the dipole at 99.7% C.L.. Keywords->
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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2010/03/019